Is Mary the Greatest of All Creatures?

Aquinas says that even you and I can merit Condein Lee in so far as the Holy Spirit is meriting within us. But when we put Mary into a kind of separate category, it seems like we talk about Mary as a distinct category between God and creaturebetween creator and creature. That's where my unease comes in because as great as Mary is, and Mary is the greatest of all creatures, there's no question about it.